Răspuns :
x+672-232+222=989-645+113+423
x+440+222=344+536
x+662=880
x=880-662
x=218
Succes!
x+440+222=344+536
x+662=880
x=880-662
x=218
Succes!
X+672-232+222=989-645+113+423
x+672-232+222=344+113+423
x+672-232+222=880
x=880-222+232-672 am folosit metoda mersului invers
x=658+232-672
x=890-672
x=218
x+672-232+222=344+113+423
x+672-232+222=880
x=880-222+232-672 am folosit metoda mersului invers
x=658+232-672
x=890-672
x=218